This download is from Vodafone Essar Limited but will work on ANY carrier's 8110 model BB. (Not 8100, 8120 or 8130)

1. Download the above OS file to the PC then install it to the PC by running (double clicking) the file you downloaded. (Vista users be sure to right click on the .exe file and select "Run As Adminstrator.")
2. Go to c:\program files\common files\research in motion\apploader and delete the file named "vendor.xml."
3. Plug in BB and double click on "Loader.exe." It's located in the same place as the above vendor.xml file.

The process takes about 45 minutes to an hour depending on how much data you have to backup and restore during the process. Once it's done loading the new OS it will reboot (it may do this twice during the entire process.) You will see a white screen with an hourglass for up to 20 minutes at a time while the DM says "waiting for initialization."
If, for some reason, you end up with a white screen with small icons and the number 507, simply connect to the PC again and run Loader.exe again and it should load the OS to the device.

I have a 8110 and have had problem with accessing websites that require me to enter a user/password. When I choose to login it says "You are attempting to open a secure connection, but the server's certificate is not trusted. It won't let me continue. How do I get this to go away. I recently went to an ATT store and went through an exchange of devices, which had 4.5 loaded. I didn't get this same error. I've not gone back to my previous device which has 4.3 OS.

I downloaded 4.5.252 and tried to update my OS. I received and error "unable to complete loading operation" "unexpected error encountered" (A:0x00000001).

Two questions:

1) how do I fix my trusted certificate issue?
2) Is there a way to upgrade my OS version with this error?